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 Heater problem

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hathan
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Number of posts : 52
Age : 36
Home City : birmingham
Model and year : 1994 Hiace Super Custom
Registration date : 2010-06-12

PostSubject: Heater problem   Sun Nov 28, 2010 2:34 pm

Hi i gt no hot air in my 1995 3.0 SC, any suggestions to were i should start looking 1st.....has anyone ever done a thermostat b4....
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chrisandhiace
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Number of posts : 502
Age : 55
Home City : Preston
Model and year : LH 107 4wd 1992
Registration date : 2008-11-18

PostSubject: Re: Heater problem   Sun Nov 28, 2010 7:25 pm

1st check you have full compliment of coolant in there...low coolant = air in front heater matrix
Are the heater valves open?...trace the heater hoses to get to the valve and ensure its working...does the rear heat work?
The heaters should work regardless of what the themostat is or is not doing
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hathan
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Home City : birmingham
Model and year : 1994 Hiace Super Custom
Registration date : 2010-06-12

PostSubject: Re: Heater problem   Mon Nov 29, 2010 9:15 am

Hi thanks 4 reply, and 'No the rear heaters don't work, they never have blown hot air, they just blow cold air, as for the front 1's, what if their is air in the matrix how do i get rid of that....
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simongd
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Number of posts : 176
Home City : Knowsley, Liverpool
Model and year : LH100G 1992 2.4 EFi turbo
Registration date : 2010-01-28

PostSubject: Re: Heater problem   Mon Nov 29, 2010 10:04 am

Perhaps there is a load of gunk in the system. Could try back flushing through one of the hoses (take your pick). May be worth getting a bottle of Forte radiator flush. You need to sort this problem asap before it causes head problems.

Get under the car below where the rear heater is and check the mechanism hasn't ceased. This gets exposed to salt, water and grit. There is a steel cable down there.

If there is air in the heater matrix the water pump will circulate out and round to the top of the rad where it can be replaced with coolant (unless it is blocked- see above back flush and Forte)
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chrisandhiace
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Number of posts : 502
Age : 55
Home City : Preston
Model and year : LH 107 4wd 1992
Registration date : 2008-11-18

PostSubject: Re: Heater problem   Mon Nov 29, 2010 11:53 am

Good advice....I'd follow it.

Check carefully the valves operation....apparently they can 'appear' to work externally without the flap in the valve moving.
I'd pull the hoses to the rear matrix / valve and flush through with a garden hose.

No heat going through the top matrix is more worrying...usually coolant loss or head leak.
Air should bleed out naturally if the heater valves are open....remove the pressure cap and let the engine run to operatin temp topping it up as required

Have you had the vehicle long?.....ie: did it used to be OK?
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hathan
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Model and year : 1994 Hiace Super Custom
Registration date : 2010-06-12

PostSubject: Re: Heater problem   Tue Nov 30, 2010 9:22 pm

it use to be fine before, i was getting hot air, but now its cold no loss of coolant, dont seem like any head probs, is the thermostat a thing to look into, dnt get me wrong pipl i do get sum warm air buts its not extremly hot.....
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chrisandhiace
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Home City : Preston
Model and year : LH 107 4wd 1992
Registration date : 2008-11-18

PostSubject: Re: Heater problem   Tue Nov 30, 2010 10:15 pm

The sub zero temps we have at the moment will negatively influence the heater output considerably.
Try feeling the hoses for consistancy...check the valves....is the air ducting still sealing well?
The thermo operation should'nt affect things too much...is it just the cold snap thats brought it on?
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ruffnut
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Home City : Highett Australia
Model and year : kzh100 1996
Registration date : 2008-02-28

PostSubject: Re: Heater problem   Tue Nov 30, 2010 10:48 pm

have you checked the temp setting on the dash I had that problem then relised the dash setting was set to 17 degrees turned it up and ooooh loverly and warm Very Happy

p.s. i Don't mean to make light of your problem but a possablity maybe
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AussieQ
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Age : 70
Home City : Hervey Bay Qld
Model and year : 1994 sc
Registration date : 2008-08-15

PostSubject: Re: Heater problem   Thu Dec 02, 2010 3:49 am

I've done that also with the aircon... wondering why it was bloody warm then saw it was up on Winter setting .
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hathan
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Model and year : 1994 Hiace Super Custom
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PostSubject: Re: Heater problem   Fri Dec 17, 2010 7:31 pm

Iv changed the thermostat my old one was knackerd, but its still not blowing hot air only warm, n i can also hear water like from the matrix everytime i drive faster i can hear it more, is that an airlock if so do they self bleed..
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AussieQ
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PostSubject: Re: Heater problem   Fri Dec 17, 2010 8:55 pm

Turn both front and back heaters on and run motor while keeping eye on level in rad. Is it overheating at all? Motor that is
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hathan
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Model and year : 1994 Hiace Super Custom
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PostSubject: Re: Heater problem   Fri Dec 17, 2010 10:47 pm

thanks Aussie no overheating at all, all runing fine as usual........il do that and see how things go
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hathan
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Model and year : 1994 Hiace Super Custom
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PostSubject: Re: Heater problem   Mon Dec 20, 2010 1:23 pm

still no hot air like i use to have and im still getting water bubbling sound from behind the dashboard......
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chrisandhiace
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Model and year : LH 107 4wd 1992
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PostSubject: Re: Heater problem   Mon Dec 20, 2010 9:45 pm

I'd look at whats been suggested earlier...but bubbling noises = air in coolant....not heat in front matrix (if all else check ok) = lots of air.
I'd get it checked out for possible cracked head or head gasket problem.
THe only other way air can get in is through 1 way pinhole leaks / bad connections...where it holds the pressure...but on cool down sucks air in (sort of flap effect). Examine what happens when its in the cool down/ vacuum mode...ensure it sucks back from the expansion tank ok...
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Clive
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Model and year : 2003 Range Rover 4.4 goes like a rocket and drinks like Oliver Reed!
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PostSubject: Re: Heater problem   Tue Dec 21, 2010 8:33 am

Check or replace the hose within the expansion bottle and the pressure cap.

Any problems starting as that would indicate a cracked head.
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hathan
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Model and year : 1994 Hiace Super Custom
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PostSubject: Re: Heater problem   Tue Dec 21, 2010 10:51 am

Its starting to struggle starting up but thats due to the cold weather and me using bio diesel, but im flushing the system out now with normal diesel, i no its not a cracked head bcos their are other symptoms that come with that which my car dosnt have......and no loss of power....as for the bubbling noise coming from the matrix iv had that in my previous jap sport cars too.....
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simongd
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Home City : Knowsley, Liverpool
Model and year : LH100G 1992 2.4 EFi turbo
Registration date : 2010-01-28

PostSubject: Re: Heater problem   Tue Dec 21, 2010 1:15 pm

I'd also check your radiator for rust stains, indicating cracks in the brass tanks. Thats what happened to mine. Probably what killed the head.
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hathan
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Model and year : 1994 Hiace Super Custom
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PostSubject: Re: Heater problem   Tue Dec 21, 2010 1:36 pm

what are the signs of a cracked head, i got no loss in power it drives all good other then heater problem, no overheating.....no losss of coolant, no loss of oil, nothing to indicate i got a cracked head as far as my experience go's with cars...
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chrisandhiace
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Model and year : LH 107 4wd 1992
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PostSubject: Re: Heater problem   Tue Dec 21, 2010 3:43 pm

Hopefully that is not your problem.....but it has to start somewhere before the crack gets bigger and starts giving other more disabling symptoms.
(I know what you mean about the gurgling..our focus does it sometimes but is fine for long distance drives...so far!)

Exhaust gas blowing into the coolant...the front matrix being the highest point fills with air....or coolant dripping into the piston chamber...the latter can cause difficult starting or even a hydraulic lock.
A long fast/high revving motorway run (30 mins+) would result in coolant being chucked out of the expansion tank overflow pipe.

Have you examined the heater valve?...are you sure its fully open?.....really check it out until you are convinced.

Have another look and try bleeding the system again...maybe park it on a downhill to encourage the matrix (now lowered) to purge of air...short blips on the throttle can help move/shock the air pockets about.
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hathan
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Number of posts : 52
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Model and year : 1994 Hiace Super Custom
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PostSubject: Re: Heater problem   Tue Dec 21, 2010 4:29 pm

how do i check the heater valve, n wat do u mean by short blips on the throttle.
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chrisandhiace
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PostSubject: Re: Heater problem   Tue Dec 21, 2010 9:25 pm

OK..now we are getting somewhere....this is for 2.8...not sure on 3 ltr
Outside the van, look through the vents below the front grill with a torch...look up slightly...you'll see the pipes, cable and valve.
If you can get someone inside moving the heat slider (which is cable linked to the valve) you'll see it move through the vents.
If you can somehow feel..or measure the temp at the pipes each end of the valve etc...just to confirm heat is going through.
Apparently, things can look like the valve is working...but the flap has come adrift in the valve...never had experience of that myself.

By blip the throttle I mean short sharp revs....on and off quickly...introduces some unpredicatble surges through the cooling system which can help hit dormant air pockets....
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hathan
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PostSubject: Re: Heater problem   Tue Dec 21, 2010 9:48 pm

Thanks for the advice il give that a go...
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splodge



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Home City : Otematata
Registration date : 2011-05-11

PostSubject: Re: Heater problem   Wed May 11, 2011 12:46 am

How did it go?

Sorry folks for wading in without introducing myself: I have a 93 hiace with exactly the problem mentioned here. The heater matrix only gets luke warm and the air that comes through the vents is only a few degrees warmer than the outside air.

Nothing wrong with the valve; had that apart and looked through it.

Done a back flush of the matrix. A lot of rusty flakey gunk came out and about 20 lites of clean water through it before it started running clear. I thought that must be it but after connecting everything back up and topping up the coolant, still the same symptoms exist.

I've taken the ducting between the fan and the matrix off and felt it. The pipes in and out get (scalding) hot but only the very bottom of the matrix receives any of that heat, most of it stays cool.

I'm guessing there's air in the matrix somehow.
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chrisandhiace
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Model and year : LH 107 4wd 1992
Registration date : 2008-11-18

PostSubject: Re: Heater problem   Wed May 11, 2011 10:08 am

Maybe the matrix is partially clogged?....You could also double check the valve that diverts coolant to the matrix...I've read (but not experienced) that the flap can fall off its spigot inside. Outwardly all looking good.
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splatt4000
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Model and year : 1995 2.8l 3L diesel engine Hiace Reimo high-top campervan - imported to UK.
Registration date : 2013-11-23

PostSubject: Re: Heater problem   Sat Nov 23, 2013 9:07 pm

Hi - first post here. Just bought a 1995 Hiace camper imported from Japan in 2007. Came back from a ride out today and realised the heating is not quite up to a mild English winter's day - should it be?

This thread look very helpful. I'll check the control valve tomorrow, and the heater hoses for temp too.

But wondering if any of you here ever sorted out the heater problems in this thread...?

Sam
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